AES加解密（支持中文）

引用：

import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

	private static final String KEY_ALGORITHM = "AES";
	private static final String DEFAULT_CIPHER_ALGORITHM = "AES/ECB/PKCS5Padding";// 默认的加密算法

	public static byte[] initSecretKey(String kst) {

		// 返回生成指定算法密钥生成器的 KeyGenerator 对象
		KeyGenerator kg = null;
		try {
			kg = KeyGenerator.getInstance(KEY_ALGORITHM);
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
			return new byte[0];
		}
		// 初始化此密钥生成器，使其具有确定的密钥大小
		// AES 要求密钥长度为 128
		if (null != kst && kst.length() > 0) {
			kg.init(128, new SecureRandom(kst.getBytes()));
		}else {
			kg.init(128);
		}
		// 生成一个密钥
		SecretKey secretKey = kg.generateKey();
		return secretKey.getEncoded();
	}
	
	public static byte[] p7(byte[] dataBytes, int blockSize) {
		int plaintextLength = dataBytes.length;
		if (plaintextLength % blockSize != 0) {
			plaintextLength = plaintextLength
					+ (blockSize - (plaintextLength % blockSize));
		}
		byte[] plaintext = new byte[plaintextLength];
		System.arraycopy(dataBytes, 0, plaintext, 0, dataBytes.length);
		return plaintext;
	}
	
	private static Key toKey2(byte[] key, int size) {
		// 生成密钥
		return new SecretKeySpec(p7(key, size), KEY_ALGORITHM);
	}

	
	public static byte[] encrypt(String content, byte[] key) throws Exception {
		// 实例化
		Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);
		Key k = toKey2(key, cipher.getBlockSize());
		// 使用密钥初始化，设置为加密模式
		cipher.init(Cipher.ENCRYPT_MODE, k);
		// 执行操作
		return cipher.doFinal(content.getBytes("utf-8"));
	}
	
	public static byte[] decrypt(byte[] data, byte[] key) throws Exception {
		// 实例化
		Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);
		Key k = toKey2(key, cipher.getBlockSize());
		// 使用密钥初始化，设置为解密模式
		cipher.init(Cipher.DECRYPT_MODE, k);
		// 执行操作
		return cipher.doFinal(data);
	}

	private static String showByteArray(byte[] data) {
		if (null == data) {
			return null;
		}
		StringBuilder sb = new StringBuilder("{");
		for (byte b : data) {
			sb.append(b).append(",");
		}
		sb.deleteCharAt(sb.length() - 1);
		sb.append("}");
		return sb.toString();
	}

	public static void main(String[] args) throws Exception {
		byte[] key = initSecretKey("abcdefghijklmnop");//128  16位
		String data = "jk_fgju_nfb_加密数据";
		System.out.println("加密前数据: byte[]:" + showByteArray(data.getBytes()));
		byte[] encryptData2 = encrypt(data, key);// 数据加密
		System.out.println("加密后数据: byte2[]:" + showByteArray(encryptData2));
		// System.out.println("加密后数据: hexStr:"+Hex.encodeHexStr(encryptData));
		byte[] decryptData2 = decrypt(encryptData2, key);// 数据解密
		System.out.println("解密后数据: byte2[]:" + showByteArray(decryptData2));
		System.out.println("解密后数据: string2:" + new String(decryptData2, "utf-8"));
	}

再转一篇：http://blog.youkuaiyun.com/huangwenkui1990/article/details/48292865?locationNum=11&fps=1